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JustenGT4
Forums Junkie

Location:
Canberra
Registered:
June 2003

Re: GT4 Boost Arrangements Question	Fri, 29 August 2003 02:19

I have quite a few changes to make there Mitch. For starters you can't have the VSV less than the wastegate, that's impossible. Heres' what i have measured off my own and others ST185 Wastegate: 6psi T-VSV: 6psi Max. Boost: 9psi Fuel Cut: 12psi Std ECU mapped to: 12psi ST185RC Wastegate: 6psi T-VSV: 6psi Max. Boost: 9psi Fuel Cut: 16.7psi Std ECU mapped to: 16.7psi The 185 and 185 RC have exactly the same boost control, only the ECU mapping is different so you can get more boost with a bleed valve etc. The RC ECU is mapped to 1bar which is also where the fuel cut is set, however, the fuel cut in practise does seem to cut in later, usually over 17psi and sometimes as much as 19psi. Although not mapped to 19psi the RC ECU will run mixtures just fine at that boost and the turbo is still pushing out enough efficiency to make that boost level worthwhile. Any more and it's really diminishing returns plus you run the extra risk of meltdown [Report message to a moderator]

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